Gameplay Feedback, I am afraid it's again is out of touché with RTS or E-Sports, also Casual Audience

The point is, they aim at so many diverse groups, it will be hard to please them all.

There is a good tale what happens if you listen to everybody.
“The Old Man, the Boy, and the Donkey”
They were on the way and did listen to people, till they decided to carry the donkey.

And why add the Eagle ability? And that’s are good examples, one of the mechanics that we get is older than AoE, the other is meanwhile updated in many games. How are those decisions made? Shouldn’t we rather get a mechanic from Starcraft2, than from Warcraft?

Exactly here is the problem, E-Sport would require from ground on a completely different game.
And because a game is more casual friendly, doesn’t mean its more fun to play.

Here just as example. Tetris with (Only I pieces)
Sure it’s more accessible and easier to play, there are many memes and jokes about such version, but even as casual you would fast loose interest and simply play real Tetris instead.